Tap wrench



July 24, 1956 w. R. TOMCHEK TAP WRENCH Filed Aug. 30, 1954 INVENTOR. Wa/zer R Tame/7 e/r Patented July 24, 1956 TAP WRENCH Walter R. Tomchek, Garwood, N. J.

Application August 30, 1954, Serial No. 452,995

2 Claims. (Cl. 279-44) This invention relates to improvements in tools and has particular reference to a tap wrench. The principal object of this invention is to provide a tap wrench which will accommodate for large and small drills, taps or reamers, thus eliminating the necessity of having to employ two tap wrenches for the most generally used sizes of drills, etc.

A further object is to produce a wrench which conforms to the ordinary standard practice and one which is economical to manufacture, light in weight, easily transportable, and one which may be quickly adjusted.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numbers are employed to designate like parts throughout the same,

Fig. 1 is a vertical cross section of my wrench;

Fig. 2 is a perspective view of the inner chuck;

Fig. 3 is a fragmentary cross sectional view showing the inner chuck lowered to position for holding a small tap or drill; and

Fig. 4 shows the abutment ring.

In drilling, tapping or reaming, the tool is first inserted in a wrench which is tightened about the head of the tool and then the tool is inserted in the hole and rotated so as to perform its particular function. These tools have varying standard diameters, that is, all taps, for instance, within certain limits, will have a shank of the same diameter. All taps within other limits will have a larger shank diameter.

Therefore it has been necessary to provide a tap wrench for each set of sizes of tools.

Applicant has devised a tap wrench which will accom modate itself for several standard sizes of tool shanks.

In the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates the head of a wrench having a slidable handle 6 adjustably secured by an engaging thumb screw 7. The lower part of the head has a tubular extension which is slotted as shown at 8 and has a bore 10 to form a plurality of tool-engaging jaws as shown at 9 and 11. These jaws are each provided with a thread as shown at 12 adapted to be engaged by a nut 13 having an inner cone shape as shown at 14, which engages with the tapered ends 16 of the jaws 9 and 11.

Slidable in the bore 10 is an auxiliary jaw member designated as a whole by the numeral 17. This auxiliary member has radially arranged fins 18 which are threaded a shown at 19, the lower portion of which is slotted as shown at 21. The lower ends of the jaws thus formed by the slotting is bored as shown at 22 to form a gripping surface for smaller tools.

A ring 23 is mounted in the slot 24 formed in the tubular extension. A threaded ring 26 engages the threads 19 of the fins l8 and as this ring 26 abuts either the bottom of the head 5 or the split ring 23, it cannot move up or down on the tubular portion forming the jaws 9 and 11.

The result of this construction is that when the ring 26 is turned in one direction, the auxiliary body member 17 will be moved to the upper position shown in Fig. 1. At this time the shank of a relatively large tap can be inserted between the jaws 9 and 11, the nut 13 tightened, which will, of course, move the jaws against the shank and hold the same against rotation in the wrench.

When it is desired to use a tool having a smaller shank, then the ring 26 is rotated in such a manner as to cause the fins of the member 17 to move downwardly so that the lower end of the same will be substantially in alignment with the lower end of the jaws 9 and 11.

By now inserting the shank of a smaller tool in these auxiliary jaws and tightening the nut 13, the jaws 9 and 11 will press inwardly against the auxilary jaws and consequently the smaller shanked tool Will be held against rotation in the wrench.

It will thus be seen that by moving the auxiliary jaws up or down the tool will readily accept and retain against turning, shanks of different sizes.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A tool holder having a head, a tubular extension formed integral with said head, said extension being slotted to form two engaging jaws, a threaded cam ring encircling said jaws so as to move said jaws inwardly, an auxiliary member slidably mounted in said tubular member, threaded fins formed on said auxilary member, said fins extending into the slots of said tool engaging jaws, a second nut rotatably on said jaws and engaging said threaded fins, means for positioning said last mentioned threaded member rotatably on said slotted jaws whereby rotation of said second mentioned threaded member will eflfect up and down movement of said auxiliary member in said tubular member.

2. A tool holder having a head, a tubular extension formed integral with said head, said extension being slotted to form tool-engaging jaws, a threaded cam ring encircling said jaws so as to move said jaws inwardly, an auxiliary member slidably mounted in said tubular member, threaded means for moving said auxiliary member in said tubular member, said auxilary member having tool-engaging jaws, said threaded means including a second nut rotatably mounted on said tubular member and having toothed engagement with said auxiliary member, means for rotatably positioning said last-mentioned nut at a point adjacent the head of said tool whereby the threaded engagement between said second mentioned nut and said auxiliary member will effect the movement of said auxiliary member in said tubular member.

Dechnik Oct. 14, 1913 Procunier Nov. 9, 1937 

